| Date | November 2021 | Marks available | 1 | Reference code | 21N.1.HL:.tz0.24 |
| Level | Higher Level | Paper | Paper 1 | Time zone | time zone 0 |
| Command term | Question number | 24 | Adapted from | N/A |
Question
What is the benefit of using the coefficient of variation over standard deviation?
A. The coefficient of variation allows a researcher to compare the variance of two datasets and is expressed as a percentage.
B. The coefficient of variation allows a researcher to compare the difference in the standard deviations of two unrelated means and is expressed as a percentage.
C. The coefficient of variation is a value that will measure the central tendency of data.
D. The coefficient of variation is derived from a t-test and provides a p-value.
Markscheme
B
Examiners report
This was the 4th hardest question with most candidates incorrectly selecting option A. Option B is the more accurate definition for this seldom used aspect of statistical analysis.
